无功的

In the probabilistic model for wind farm, the uncertainties of wind speed is takes into account, and the real power injected and reactive power absorbed by the wind turbine are described as the function of the voltage magnitude, the slip of the induction machine and the circuit parameters of the wind turbines. In the unified iteration method, the slip of induction machine is introduced as the new correction value. The Newton-Raphson algorithm is used to solve the unified iteration of state variable and slip. Thus, the proposed method retains the quadratic convergence of the Newton-Raphson algorithm.

该风电概率模型考虑风速的随机性，将风机输出的随机有功功率和吸收的随机无功功率描述为电压幅值、异步机的滑差和风轮机的电路参数的函数；联合迭代方法中，异步风力发电机的滑差作为新的修正量被引入，使用牛顿-拉夫逊方法求解关于潮流状态变量和滑差的联合迭代，加热器因而迭代过程保持了牛顿-拉夫逊方法的平方收敛性。

For the principal component, namely the voltage stability analysis function, three kinds of nodal injection power modes are defined, i.e., the random varying direction of load, the response setting direction of generator and the ratio of active power component to reactive power component in load power, and a continuous power flow model that is easy to utilize and comprehend by dispatching center is built, based on this model three kinds of formulae to calculate the sensitivities of loading margin with respect to three kinds of nodal injection power modes are derived respectively, and on this basis the influence of nodal injection power mode on loading margin can be analyzed in order that the voltage collapse can be avoided by fast implementing early warning of voltage stability and adopting effective corrective control.

文章针对N-EMS的主要组成部分--电压稳定分析功能，定义了3类节点注入功率模式：负荷的随机变化方向、发电机的响应设定方向、负荷的有功和无功比例，建立了易于被调度中心运用和理解的连续潮流模型，在此模型基础上分别推导得到负荷裕度对3类模式的灵敏度公式，据此分析节点注入功率模式对负荷裕度的影响，以便能够快速进行电压稳定预警和采取有效的校正控制来避免电压崩溃。

In the developed prototype, the conduction cooling and the high temperature superconductive techniques are used.

这样的装置能根据电力系统的需要，利用所储存的电能，进行快速的动态有功和无功功率的调节，主动参与系统的稳定控制，是一种理想的提高电力系统动态性能和解决系统稳定性的手

Taking the particularity of the connection scheme of novel converter transformer and its filter system into account, it's necessary to find out the relation between its commutated reactance and short-circuit impedances between windings and fundament frequency impedance of filter branch for impedance design of novel converter transformer and reactive power ...

考虑到新型换流变压器及其滤波系统的接线方案较为特殊，了解其换相电抗与绕组之间的短路阻抗及阀侧滤波支路的基频阻抗之间的关系，对新型换流变压器的阻抗设计和阀侧无功补偿度的优化配置是十分必要的。

And the traditional passive filter's function is also limited for avoiding the resonance and harmonic enlarging. The auto-compensator and harmonics shielding converter transformer can be used to solve these problems, which is based on the principle of the winding ampere and turn's balance. This paper elaborates this kind of transformer filter mechanism. In the view of the HVDC system, a new winding connection plan is proposed, and the filter optimization model is created.

作者基于自耦补偿与谐波屏蔽的换流变压器，针对某实际的HVDC模拟系统，提出了与该变压器配套的滤波装置的接线方案，并将外罚函数法和遗传算法相结合，对上述滤波装置进行优化设计，建立了以初期投资最小为优化目标、满足系统无功需求的滤波器优化配置的数学模型。

The problem of phase order in transformer substation s erection;2. The wire linking is completely checked by active power value,reactive power value,mutual inductor polarity, phase order and the link of detecting instruments.

分析了功率测量的基本原理、判断错接线的方法，提出用有功测量值来判断接线的正确性是不全面的，应从有功测量值、无功测量值、互感器极性和相序以及测量仪器的接线判断接线的正误。

The power factor is a power supply system of an importance technique economy index sign, use electricity equipments at consume useful power of in the meantime, return have a great deal of of useless the power be send by the power supply to burden, what power factor reflection is to use electricity equipments at consume certain of have a great achievement power of in the meantime demand of have no achievement power.

功率因数是供电系统的一项重要技术经济指标，用电设备在消耗有用功率的同时，还有大量的无用功率由电源送往负荷，功率因素反映的是用电设备在消耗一定的有功功率的同时所需要的无功功率。

In software,we adopt the Goertzel arithmetic to realize FFT,cooperates with other software models such as electric parameter arithmetic model and keyboard program model in realizing all of the design functions.

谐波污染会导致电网损耗的增加，降低用电设备的效率和性能，引起设备的过载，威胁用电安全；无功功率会引起线损和变压器损耗，降低发电机的有功输出，破坏电网供电的稳定。

In this paper, taking nodal injection power and voltage operation curve of PV node as foundation, according to the basic property of numerical characteristics of random variables and relevant equations for probabilistic load flow calculation the expectations of nodal current, reactive power at PV node and power at balancing node as well as computing formula of covariances are derived by different methods; the computation accuracy of various algorithms are compared and analyzed.

文章以节点注入功率和PV节点电压运行曲线为基础，依据随机变量数字特征的基本性质和概率潮流计算的相关方程，分别采用不同的方法推导了节点电流、PV节点的无功功率及平衡节点功率的均值和协方差计算公式，比较和分析了各种算法的计算精度。

In order to reduce the production process mill system power supply system of the impact of power quality,improve the stability of equipment to meet national standards and power quality of the electricity sector of the target requirements,in the rolling mill factory production lines to install a set of 30kv side bus SVC.It restrained the molestations of power plants lines,make important roles of improve power quality,improve power factor,and level off the run level of electric web.

为了减轻轧机系统生产过程中非线性冲击负荷对供电系统电能质量的影响，提高设备运行的稳定性，满足国家标准和电力部门对电能质量指标的要求，在生产线30kV母线侧，装设了一套静止无功补偿装置，结果是把生产线对供电系统电能质量的干扰抑制到一个较低水平，对改善供电系统的电能质量，提高功率因数，稳定电网运行水平起到了极其重要的作用。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。